diff --git a/slides/allocation_dynamique.md b/slides/allocation_dynamique.md
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+---
+title: "Allocation dynamique de mémoire"
+date: "2021-11-09"
+patat:
+    wrap: true
+    margins:
+        left: 10
+        right: 10
+---
+
+# Allocation dynamique de mémoire (1/8)
+
+- La fonction `malloc`{.C} permet d'allouer dynamiquement (pendant l'exécution du programme) une zone de mémoire contiguë.
+
+    ```C
+    #include <stdlib.h>
+    void *malloc(size_t size);
+    ```
+- `size`{.C} est la taille de la zone mémoire **en octets**.
+- Retourne un pointeur sur la zone mémoire ou `NULL`{.C} en cas d'échec: **toujours vérifier** que la valeur retournée est `!= NULL`{.C}.
+
+# Allocation dynamique de mémoire (2/8)
+
+- On peut allouer et initialiser une `fraction_t`{.C}:
+
+    ```C
+    fraction_t *num = malloc(sizeof(fraction_t));
+    num->num = 1;
+    num->denom = -1;
+    ```
+- La zone mémoire **n'est pas** initialisée.
+- Désallouer la mémoire explicitement $\Rightarrow$ **fuites mémoires**.
+<!-- - Toujours garder un pointeur sur la mémoire allouée sinon **pointeur pendouillant**. -->
+
+![La représentation mémoire de `fraction_t` et fuites.](figs/pointer_struct_ok.svg){width=100%}
+
+# Allocation dynamique de mémoire (3/8)
+
+- La fonction `free()`{.C} permet de libérer une zone préalablement allouée avec `malloc()`{.C}.
+
+    ```C
+    #include <stdlib.h>
+    void free(void *ptr);
+    ```
+- Pour chaque `malloc()`{.C} doit correspondre exactement un `free()`{.C}.
+- Si la mémoire n'est pas libérée: **fuite mémoire** (l'ordinateur plante quand il y a plus de mémoire).
+- Si la mémoire est **libérée deux fois**: *seg. fault*.
+- Pour éviter les mauvaises surprises mettre `ptr`{.C} à `NULL`{.C} après
+  libération.
+
+# Allocation dynamique de mémoire (4/8)
+
+## Tableaux dynamiques
+
+- Pour allouer un espace mémoire de 50 entiers: un tableau
+
+    ```C
+    int *p = malloc(50 * sizeof(int));
+    for (int i = 0; i < 50; ++i) {
+        p[i] = 0;
+    }
+    ```
+
+## Arithmétique de pointeurs
+
+- Parcourir la mémoire différemment qu'avec l'indexation
+    
+    ```C
+    int *p = malloc(50 * sizeof(int));
+    // initialize somehow
+    double a = p[7];
+    double b = *(p + 7); // on avance de 7 "double"
+    p[0] == *p; // le pointeur est le premier élément
+    ```
+
+# Allocation dynamique de mémoire (5/8)
+
+## Arithmétique de pointeurs
+
+![L'arithmétique des pointeurs.](figs/pointer_arithmetics.svg){width=100%}
+
+## Quelle est la complexité de l'accès à une case d'un tableau?
+
+. . .
+
+$$
+\mathcal{O}(1).
+$$
+
+# Allocation dynamique de mémoire (6/8)
+
+## Pointeur de pointeur
+
+- Tout comme une valeur a une adresse, un pointeur a lui-même une adresse:
+
+    ```C
+    int a = 2;
+    int *b = &a;
+    int **c = &b;
+    ```
+- Chaque `*`{.C} ou `&`{.C} rajoute une indirection.
+
+# Allocation dynamique de mémoire (7/8)
+
+## Pointeur de pointeur
+
+![Les références de pointeurs.](figs/double_pointeur.svg){height=100%}
+
+# Allocation dynamique de mémoire (8/8)
+
+- Avec `malloc()`, on peut allouer dynamiquement des tableaux de pointeurs:
+
+    ```C
+    int **p = malloc(50 * sizeof(int*));
+    for (int i = 0; i < 50; ++i) {
+        p[i] = malloc(70 * sizeof(int));
+    }
+    int a = p[5][8]; // on indexe dans chaque dimension
+    ```
+
+- Ceci est une matrice (un tableau de tableau).
+
+# Les *sanitizers*
+
+Problèmes mémoire courants:
+
+* Dépassement de capacité de tableaux.
+* Utilisation de mémoire non allouée.
+* Fuites mémoire.
+* Double libération.
+
+Outils pour leur détection:
+
+* Valgrind (outil externe).
+* Sanitizers (ajouts de marqueurs à la compilation).
+
+Ici on utilise les sanitizers (modification de la ligne de compilation):
+
+```bash
+gcc -o main main.c -g -fsanitize=address -fsanitize=leak
+```
+
+**Attention:** Il faut également faire l'édition des liens avec les sanitizers.
+
diff --git a/slides/figs/double_pointeur.svg b/slides/figs/double_pointeur.svg
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index 0000000000000000000000000000000000000000..f5d9e0ce990c493c23632624953dc22418a5f7dc
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